NONAPEPTIDE-4 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

NONAPEPTIDE-4

Safety grade: A

Nonapeptide-4 is a small protein fragment made up of nine amino acids linked together. It's a lab-created ingredient designed to help improve skin's texture and appearance by supporting the skin's natural structure.

This ingredient is used in skincare products to condition and improve skin texture by helping to maintain skin firmness and elasticity.

Graded using: COSING.

Last verified: May 26, 2026